Stretched polyamide film

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 5/18 (2006.01) B29C 55/02 (2006.01) B32B 27/34 (2006.01) C08L 77/06 (2006.01) C08L 23/26 (2006.01)

Patent

CA 2577707

A stretched film obtained from a resin blend comprising: a polyamide resin (X) comprising structural diamine units comprising 70 mol% or more m- xylylenediamine units and structural dicarboxylic acid units comprising 70 mol% or more C6-12 aliphatic .alpha.,.omega.-dicarboxylic acid units; and a noncrystalline polyamide resin (Y) and/or an ionomer resin (Z). A film obtained by melt-extruding the resin blend can be stretched in a high stretch ratio exceeding 4 in at least one of the MD direction and TD direction without breaking. The highly stretched film obtained through stretching in a stretch ratio exceeding 4 is satisfactory in gas-barrier properties and transparency.

Cette invention a pour objet un film étiré obtenu à partir d~un mélange de résines comprenant : une résine polyamide (X) comprenant des unités de diamine structurelle comprenant 70 % en mole ou plus d~unités de m-xylylènediamine, et des unités d~acide dicarboxylique structurel comprenant un minimum de 70 % en mole d~unités d~acide .alpha.,.omega.-dicarboxylique aliphatique en C6-12 ; et une résine polyamide non cristalline (Y) et/ou une résine ionomère (Z). Le film obtenu en procédant à la fonte et au filage du mélange de résines, peut être étiré selon un rapport d~étirement élevé supérieur à 4, dans au moins l~une des directions de la machine et l~une des directions transversales sans rupture. Le film hautement étiré obtenu par étirement selon un rapport d~étirement supérieur à 4 est satisfaisant en matière de propriétés de barrière contre les gaz et la transparence.

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